Perineum
Perineum (in Surgical Anatomy).—the Perineum (in The General Acceptation Of That Term) Is One Of The Names Applied By Anatomists To The Extensive Region Which Contains The Lower Part Of The Rectum Intestine, Together With A Portion Of The Genito-urinary Organs And Their Appendages, And Of Which The Circumference Corresponds ...
Pharynx
Pharynx And Mount. (gr. Eparyt.)— The Pharynx Is A Large, Muscular, And Membra Nous Pouch, Placed Behind The Nose, Mouth, And Larynx, And Resting Upon The Cervical Vertebrte : It Extends From The Base Of The Skull Above To A Level With The Fourth Or Fifth Cervical Vertebra And The ...
Physiological Degree Of Sexual
Physiological Degree Of Sexual Tion In Hermaphrodites. Among Those Lower Tribes Of Animals, Such As The Abranchial Annelida, Pteropoda, &c. That Are Naturally Hermaphrodite, Every Individual Is In Itself A Perfect Representation Of The Species To Which It Belongs. In The Higher Orders, However, In Which The Distinction And Separa ...
Physiology Of Nervous System
Nervous System, Physiology Of.) All Nerves Of Sensation Are Excitors Of Mo Tion Under Certain Circumstances, But Especi Ally When They Are Organised At Their Periphe Ral Distribution In A Peculiar Manner. Objective And Subjective Sensations.— In The Ordinary Mode Of Exciting Sensations The Pre Sence Of An Object Is ...
Physiology Of Nervous System
Nervous System, Physiology Of The.—in Inquiring Into The Physiology Of The Nervous Systern, The First Step Is To Determine The Vital Endowments Of Nerves And Of Nervous Centres. When A Nerve Is Laid Bare In A Living Animal, And A Mechanical Or Electrical Stimulus Is Ap Plied To It, We ...
Physiology Of Tem
Tem, Physiology Of, Voi. Iii. P. 782. S.) No Doubt, However, Can Be Entertained That The Mind Is Intimately Connected With The Procre Ative Faculty, And That The Brain Controls And Animates The Desire For Sexual Enjoyment. An Affection Of The Brain, Or The Mind, As Sudden Disgust, Arrests The ...
Physiology Of The Heart
Physiology Of The Heart. Made Of Action Of The Valves Of The Heart.— While The Blood Is Rushing Through The Auri Culo-ventricular Openings During The Contrac Tion Of The Auricles, The Lips Of The Mitral And Tricuspid Valves Are Separated From Each Other And Thrown Outwards From The Axis Of ...
Pisces
Pisces. (eng. Fishes ; Ft. Poissons; Germ. Fische. )—the Lowest Class Of The Ver Tebrate Division Of The Animal Kingdom, Em Bracing Numerous Oviparous Races Of Beings Fitted By Their Organization To Live Only In Water, And Consequently They Are The Appro Priate Inhabitants Of The Ocean And Of Inland ...
Pisces_2
Pisces. The Fishes Belonging To This Division Are At Once Recognised By The Stiff Spines Which Con Stitute The First Fin-rays Of The Dorsal Fin, Or Which Support The Anterior Fin Of The Back In Case There Are Two Dorsals. In Some Cases The An Terior Dorsal Fin Is Only ...
Placenta
Placenta. The Placenta Is The Organ Provided In Each Pregnancy For The Nutrition And Respira Tion Of The Fcetus. To This It Is Connected On Its Free Side By The Umbilical Cord, While Its Opposite Or Attached Surface Is United To The Fundus, Sides, Or Lower Part Of The Body ...
Plants
Plants. - The Leaf Of The Higher Plants, Is The Unit Or Individual Of Botanists, Is Bilateral And Symmetrical—always In Idea, Generally In Fact. These Leaves Are Associated Together To Form Buds, Branches, Flowers, Or Fruits, In Whorls. Symmetrical Figures Are Often Produced By These Associations, But Yet The Pattern ...
Pleura
Pleura Is The Name Given To The Serous Sac Of The Lung And The Cavity Containing It. There Are Two Pleural Sacs, One For The Right Lung And Right Side Of The Thorax, The Other For The Left Lung And Left Side Of The Thorax. These Two Sacs Being Appokd ...
Plexuses Of The Sympathetic
Plexuses Of The Sympathetic. A. In The Head.—the Chief Plexuses Of The Sympathetic Which Exist In The Head Are The Internal Carotid Plexus, Cavernous, And External Carotid. There Are Also Present In Different Parts Of The Head Several Ganglia : The Principal Of These Are The Ciliary Ganglion, Spheno-palatine, Otic, ...
Pneumoderma
Pneumoderma. — Another Genus Of The Pteropod Mollusca, Anatomized By Cuvier, Ernbraces The Pneunzoderma, Which Presents Many Peculiarities Of Structure, More Es Pecially As Relates To The Position Of The Re Spiratory Organs And The Tentacula Placed At The Sides Of The Mouth And Other Anatomical Details, So That It ...
Poda
Poda, Ceenalorona. The Circulating System, Which, As Has Been Stated, Is Complete And Double In All The Mollusks, Is Provided In All The Species With A Systemic Heart, And In The Highest Organized Species With A Distinct Heart For The Lesser Or Branchial Circulation. The Systemic Heart That Appears In ...
Polygastria
Polygastria.* These Stomachs Be Subsequently Discovered To Be Variously Arranged In Different Genera, And Was Consequently Induced To Make These Variations In The Construction Of The Alimen Tary Apparatus A Basis On Which To Erect A Scheme For Their Further Subdivision. This Kind Of Nutritive System Of Organs He Found ...
Poplite Al Region
Poplite Al Region, And Popli Teal Artery. — The Term Popliteal Region Is Applied To That Portion Of The Lower Extremity Which Occupies The Bend Of The Knee, And Includes Also The Poste Rior Surface Of The Thigh, As High As The Junction Of Its Middle And Lower Thirds, And ...
Portal Venous
Portal Venous Syste31.—one Remarkable Class Of The Veins Of The Abdomen, Those Of The Chylopoictic Viscera, Do Not Terminate Directly In The Vena Cava, But Unite To Form A Large Ports', Which Enters The }iier, And, Branching Out Like An Artery (hence The Name Vena Arteriosa), Forms A Capillary System ...
Posterior Branches Of The
Posterior Branches Of The External Carotid.-ist. The Occipital Artery ( A. Occi Pitalis) Arises From The Posterior Side Of The External Carotid, Opposite The Lingual Or The Facial ; It Sometimes But Rarely Comes From The Internal Carotid ; It Passes At First A Little Ob Liquely Backwards Along The ...